Begin by draing or finding a face you would like to create.  Slightly cartoonish is easier than realistic.

Trace for the outlines on a new peice of paper.

Get some cardboard and tape your paper to it and gently cut out around the outside of the entire face. Put this first peice of cardboard aside, label it number 1 and do not cut it any more.

Remove the background of your face drawing and then tape and cut on a new peice of cardboard.  Set that peice aside and number it #2.  

Continue this process until you have at least 4 layers.

Glue your layers together.

Decorate.